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A bag contains cards numbered 1 through 20. One card is randomly selected. What is the probability that the number on the card is a multiple of 3 or greater than 10? Express your answer as a fraction

 Apr 26, 2020
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There are 20 cards.

 

How many are multiples of 3?    3, 6, 9, 12, 15, 18     =     6

 

How many are greater than 10?  11, 12, 13, 14, 15, 16, 17, 18, 19, 20     =     10

 

Without counting repeats there are 13 that work.

 

Probability:  13/20

 Apr 26, 2020

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